Eržen families are Croats and they are mostly from Cabar. In the past century, relatively most of Croatian residents bearing this family name were born in Cabar and Slavonski Brod. In Parg in Cabar every seventh inhabitant had the family name Eržen.
Prevalence
About 50 people with faimily name Eržen live in Croatia today, in 20 households. There were 60 of them in the middle of the past century, and their number decreased by 10 percent. They are only located in in 6 Croatian cities and 11 other places, mostly in Rasa in Labin area (<10), Batrina in Pozega area (<10), Cikovici (<10), Zagreb (<5), and in Luzani in Pleternica area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.